Does it mean ball point pen and 'pennen' is a word in itself?
"Kuglepen" is a ball point pen. "pen" is any ink-based writing tool like a birds feather or a fountain pen or a ball point pen.
All my life I have used fountain pens and biros. A biro is a ball tipped pen.
. . . named after László Biró, the Hungarian newspaper editor who (along with his chemist brother) created the first commercially viable ball-point pen (1938)